论文标题
拓扑Kagome超导体CSV $ _ {3} $ SB $ _ {5} $
Nonreciprocal Charge Transport in Topological Kagome Superconductor CsV$_{3}$Sb$_{5}$
论文作者
论文摘要
在二维超导体中广泛研究了非肾脏电荷转运现象，由于对称性破裂，这表明了单向 - 动型磁路线的磁路线。在这里，我们报告了超导CSV $ _ {3} $ sb $ _ {5} $ Thin Flakes中强烈的非转录运输现象。第二个谐波电压主要源自涡流运动的整流效应，它是用平面内和平面磁场明确开发的，它们的幅度与非中心对称超导体中的尺寸相当。第二个谐波磁路线分为几个峰，其中一些峰通过将磁场或超导转换中的电流推向迹象。非转流表明，CSV $ _ {3} $ SB $ _ {5} $中的不对称性很强。 CSV $ _ {3} $ sb $ _ {5} $中的中心对称结构和对称电子相，几乎无法诱导独特的非偏置传输现象，这可能与从非同规性的超导电参数对称性的对称性折断相关。
Nonreciprocal charge transport phenomena are widely studied in two-dimensional superconductors, which demonstrate unidirectional-anisotropy magnetoresistances as a result of symmetry breaking. Here, we report a strong nonreciprocal transport phenomenon in superconducting CsV$_{3}$Sb$_{5}$ thin flakes. The second harmonic voltages, mainly originating from the rectification effect of vortex motion, are unambiguously developed with in-plane and out-of-plane magnetic fields, and their magnitudes are comparable to those in noncentrosymmetric superconductors. The second harmonic magnetoresistances split into several peaks and some of them reverse their signs by ramping the magnetic field or the current within the superconducting transition. The nonreciprocity suggests a strong asymmetry in CsV$_{3}$Sb$_{5}$. The centrosymmetric structure and symmetric electronic phases in CsV$_{3}$Sb$_{5}$ can hardly induce the distinct nonreciprocal transport phenomenon, which could be correlated to a symmetry breaking from an unconventional superconducting order parameter symmetry.
